i'm too lazy to make the skin..
this is the one i'm using for mine, not a good one but i like it :D
[Get this skin] it's not that hard to make .. so .. if you wanna try making a skin for your own nds r4, this is DIY.
Replacing the Skin.
There are 4 pictures at the directory “system/_system_”:
logo.bmp - Background of the Top Screen of R 4' s startup.
icons.bmp -- Background of the Bottom Screen of R 4' s Startup.
bckgrd_1.bmp -- Background of the Top Screen of R 4' s Explorer.
bckgrd_2.bmp -- Background of the Bottom Screen of R 4' s Explorer.
they can be changed to fit your style.
Note:
Do not change the picture's name;
Make sure the picture is .bmp format, 8-bit/24-bit;
Make sure the picture is 256*192 pixels.
After finishing process on the pictures, copy the “_system_” folder to the root directory of the CF card.
Good Luck!