I agree with JairCrawfod and Austenite.
Your ideas are amazing by themselves. And many times, when this miniatures come to mind, they are what they are, and trying to do something larger or different doesn't work.
I also like the viola very much.
Philip Glass (i adore him) wrote "A madrigal opera" for six singers, violin, and viola. Part III of the opera is a long soliloquy for viola solo. Perhaps you like it (or you know it):