Custom icons:
-uses 32 x 32 bitmap or png files
-must be named the same as the file with and in the same directory OR they can be placed in a directory as defined in the current skin.ini under "Custom_Icon_Folder".
eg:
BAGSFC.plg - the file you want to have a custom icon
BAGSFC.plg.png - the icon file

Homebrew Covers:
- can be any size as long as it fits on screen
- can be either png or bmp files
- must be named exactly the same as the game file including the file extension
-CoverArt.ini file must be present in user files folder
- ini file example:

**********************
[NDS]
#path to folder with covers
folder = /_bagui/covers/homebrew
#image type
type = png

[plg]
#path to folder with covers
folder = /_bagui/covers/homebrew
#image type
type =  png


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