Themes in burg-themes package
The screen shot are captured using burg-emu. The screen resolution is set to 1024x768, the image is scaled to 512x384.
minimal
chiva
proto
winter
ubuntu (showing progress bar)
ubuntu2 (showing circular progress bar)
refit (showing folding menu)
sora
sora_clean (showing theme selection menu)
sora_extended (showing folding menu)
radiance
radiancetext (showing folding menu)
arabic_and_freedom
black_and_white
coffee
grub2 theme debian
More themes
You can visit the theme section of BURG forum: