I have just gotten far enough with my portfolio to expose it to your eyes. I decided to go with grayscale colors only to draw the attention to the content in the portfolio.
One thing I can mention about the responsiveness of the thumbnails in the portfolio. In order to have a grid that goes from 3 in a row to 2, I had to make 24 columns, not 12 that are enclosed in a single pair of row tags. So not 12 in total but the double. This, I understand, is the way to have a row of three change to a row of two with Bootstrap.
Let me know is something looks wonky.