I've framed them in a pale slim wooden frame with 3 inch off white mount, 3.5 inches at the bottom. They look right.
I have a 'thing' for very plain and simple frames that let the image show. (this is also what buyers want I find, to go with contemporary homes)
I'd considered a slim dark frame but liked the pale wood better in the end.
It works out cheaper to have the frames and mounts made to measure but for
me to then put the image in - dearer if the framer does that as well - I HATE doing this with pastels! they are so messy and it is so so easy to get smudgy prints on the mount or bits of pastel on the glass that you don't notice until you've put it all together and sealed the back
when are you going to post your recent work? we're waiting to see it
and Osso have you done any new work?