Use
Ulead GIF Animator
*www.ulead.com/ga/runme.htm
Its the best you can get.
It allows you to import following Animation/Video formats
AVI, FLC, FLI, FLX, MPG, MPEG, MPV, DAT, MP2
If you have a collection of images, you can resize & optimise them using a software like irfanview and create your own animation sequence using ULEAD GIF ANIMATOR.
PS:- Check out forum rules on avatars and signatures before you upload them here.