Mike Avery said it so well, so I thought we should make it a topic.  I hope he doesn't mind that I quote him:

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I like the term "mischbrot" and wish there was, or we could come up with, a term in English that was similar.  "Multi-grain" might be as close as we get, but I'd have trouble using the term "mult-grain" or even "mischbrot" to describe a bread that was part white flour and part whole wheat. 

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Now there are plenty if words for Mix (Misch) in English, we just need to use one often enough to "make it so."

Suggestions: 

Mingled Bread    Combined Bread  Jumbled Bread    Fused Bread   Fusion Bread    United Bread   Joined Bread    Amalgamated Bread    Melded Bread    Harmony Bread     Blended Bread    Compounded Bread    Bread Medley    Bread Me'lange    Potpourri Bread   Miscellany Bread  

What do you think?  Any votes or other suggestions?