I will now give an overview of the most common seal types. These are the basis for the large majority of seal techniques in the world, and you will find them extremely useful. I will also be including some advice on possible variations you could use.
The first seal type I will be covering is the containment type seal. This is probably the most widely known and understood type, as it is also the most widely used. Of course the uses of sealing something in a small scroll without increasing it's size and weight are numerous, but sadly it's familiarity causes many a student of sealing to dismiss it's usefullness as anything else. Even the possibilities of the seal as it is known are often overlooked.
For example, it is entirely possible to seal numerous explosive tags inside a scroll, channel chakra into it, and throw it over the heads of the enemy. The reason no one ever does? They simply don't think to try. The seal is looked at as a glorified pack, something to carry supplies in and nothing more. Also, what you choose to contain in the seal, once you make your own variations, is much more flexible than you might think. For example, air, lightning, sound waves, light. Combined with finer controls over how much, how fast, when to release, where to release, how much to release, and so on, this sealing type is surprisingly flexible.
Next I will address the explosive seal. In truth, this seal does largely do what it says, and little more. Once again, the biggest problem is that the possibilities of it's variations are highly underestimated. For one simple example, anyone who knows how to create the seal doesn't need to use an explosive tag so long as they have an appropriate amount of chakra. What's more, the amount of fine control afforded to the the user is much greater when creating their own seal.
This seal goes very well with the containment seal, since it is a simple variation that will allow your modified explosive seal to act as the release mechanism for the other. What's more, a simple explosion of fire and force isn't the only application. Other elements can be used as well, such as lightning. It is also possible to create a feedback loop by creating a combined explosive and containment seal that reabsorbs whatever it is expelling at a constant rate. I myself have not thought of a useful seal utilizing this technique, but the phenomenon itself is intriguing enough to warrant a mention here.
The third, and possibly most versatile of all, is the barrier seal. It has also been called the gateway, locking, and "true" seal. These numerous names alone should give you some idea of the numerous uses of this particular type of seal. Anything from massive barriers to protect or entrap an area, to sealing away the chakra of whatever it is placed on, to inducing a coma-like state in its target, this type of seal is truly the seal masters playground. If you find inspiration hard to come by, try thinking up new uses of the barrier seal.
Among the uses outlined above, the barrier seal can also be used to filter, instead of outright stop whatever passes through it. This, too, offers up a wide range of possibilities to the creative student. Combining this seal with a containment seal can offer up truly astounding results, if you figure out the correct combination. Combining it with an explosive seal is possibly one of the most difficult challenges you can undertake. However, properly done, the results are truly stunning, and, due to it's difficulty, are amongst the most unique in the world of sealing.
You will notice that I have given no concrete examples of variations that you, the reader, could make on this type of seal, and chose to stay, instead, with existing, fairly well known seals. This is because, due to the extreme flexibility of this particular family of seals, I do not wish to predispose you to a particular use of this type without first letting you experiment for yourself. If you were to become locked into a particular use of this most variable of seals, it would be a grave failing on my own part.
This will conclude my notes on seals in general. What follows is a compilation of several seals of my own creation, as well as a few that I have learned from fellow students of the art, and friends of mine. This section will include the names and rankings of the techniques enclosed, as well as a brief description of the effects, mechanics, and possible/intended uses.