We have rules concerning avatar and signature sizes.
Avatars must be 100x100 or smaller.
Signatures must be 200px TALL at the most. (THIS INCLUDES BANNERS, WORDS, LINKS, WHATEVER -- THE TOTAL SIG. You can't have six banners each 200 high!)
For the non-technically minded, that's 2 inches by 2 inches or 2 inches high on a standard monitor. Hold a ruler up to the screen if you have to. (Note that on some laptops 200px may appear smaller). If you're really not sure, have a look around you at the size of other people's signatures. If theirs are all way smaller than yours, there's probably a reason!
If you have anything more than this, a Lex mod may send you a PM. If you receive a PM and do not change your signature/avie within a week, an admin will be forced to remove it and replace it with an ugly banner.
And please...remember to KEEP IT CLEAN! If you're not sure what that means, see here.