I love the idea of being bolder with colors! I'm not the biggest fan of multiple borders (Just for my own projects, love them with what others have done). The top fabric from the first picture is really pretty and catches my eye. I would personally go with a slightly thinner border.
Also thought that maybe do a blue border (maybe a light blue to match the specks in the dot flowers) and use the orange for binding. The orange would really pop but not over power the quilt itself.

Jacobs ladder is a personal favorite and yours is very gorgeous! Can't wait to see it complete