Bulk Rainbow Roses, Other Bulk Colored Roses. Rainbow roses - also known as tie-dyed roses or multi-colored roses- are perfect for weddings and fundraisers. We also offer all of our other dyed/colored roses in bulk: Black, Blue, Red & Black mixed, etc. These roses feature incredibly vibrant and attention-grabbing colors. These are truly unique and colorful roses that are naturally grown white roses that receive a state-of-the-art treatment with an organic tint. "Most talked-about flowers ever." You can choose any color and variety. However, depending on the season, some colors may imply an additional fee, as well as exclusive varieties. Specialty colors are: Rainbow, Black, Bi-color, Tri-color Check the information box below for cm to inches conversion. If you would like longer stems or if you have any inquiry please call us toll free at 1-866-639-0277.