Graphics Ripper allows you to rip any kind of graphics from save state files (snapshots). You will be able to rip Amiga graphics, tile sets and sprites with full palette search option from WinUAE uncompressed Save States. Also supported are Atari ST, Amstrad CPC and ZX Spectrum. There are a lot of options to let you do precise searching and saving.
Full source is included if you want to add something!