wallpaper for blackbox

[crzdgns1 at starpower.net]

Hello,

I recently installed blackbox on my PII Celeron (FreeBSD-5.3-
RELEASE, Xorg) and am very happy with its minimalist approach.  
One of the things I do miss from windows XP is the ability to use my 
own pictures, or pictures I've downloaded, as wallpaper.  Is there a 
way in blackbox to use my own pictures as wallpaper?  How and 
where do I find more information?

Thanks

Mark