If you mean on the actual desktop itself, then I should tell you that fluxbox does not have desktop icons by default. That is all part of the "light" window manager experience
There are a couple of ways to get around this. You could get adesklets/gdesklets and each has their own respective launch bars or you could get a package called
iDesk. I don't know how resource intensive iDesk is but check out this link for some of the aDesklets
Desklets. I hope this helps.