What do you mean by 'pile of unnatural gifs'? And is this after you've imported them? Please be more specific about what happens and what's wrong with them.
I am assuming you're talking about character sheets, and not tiles.
Use an editor that lets you save files with transparency, so you can remove your background.
If you have 8 characters on your spritesheets, like most of the RTP ones do, give it a regular file name. It will have 12 columns, all of equal width, and 8 rows, all of equal height. If you only have 1 character on your spritesheet and no room for any more, you must give it a name that starts with $. This tells Ace it will only have 3 columns, all of equal width, and 4 rows, all of equal height. This is where most people come unstuck - they have a spritesheet that's only big enough for one character, but they forget to add $ to the filename, and when they try to use it in an event, it only selects a very small part of one sprite instead of an entire sprite.
If that's NOT the issue then yeah, can't do anything until you're more specific about what you're doing and what's going wrong.
I've moved this thread to VX Ace Support. Please be sure to post your threads in the correct forum next time. Thank you.