A lot of colors are accepted in holland lops, so you get more options. Just a few colors to avoid: anything broken (broken tort, broken blue, etc), vienna marked, blue eyed white or harlequin/tricolor you should avoid if you are breeding for show. Still, I would avoid broken x broken personally if you are breeding for pets.
Beyond that, choose a buck based on type first, before color. Tortoise bucks usually have the best type, so I would recommend finding a pretty black tort buck to breed her to. If you want more variety of color, an orange or a black tort with a blue or blue tort parent could give you some various different colors in the litter (bred to a black tort, there will likely be blacks and broken blacks, and depending on what she carries, maybe torts and broken torts too.)
:bunnyhop: 
