Goomba is a Gameboy emulator for the Gameboy Advance. Beyond the advantage of being able to store many games on one cart, Goomba also includes save states and customizable borders. At least, Kuwanger’s fork does. Also available are many palettes, along with the ability to make your own.

Release notes:

Goomba Paletted v2.37 – 2009-10-18 – Changed border format to support more tiles. Adds Super Gameboy Borders, dumped by Asaki.