Black & White might work best, but, the following colors could be incorporated as well...
Blues: Knowledge, trust, calm and honesty.
Greens: Growth, harmony and success.
Yellows: Energy, intellect, fun and youth.
To give us an idea of the overall feeling of your brand, let us know which styles you lean towards
In addition to my original comment below, since I live in the mountains and incorporate them in my photography, mountains in a literal or abstract form might work for my logo. Please see recently uploaded b&w photo...