how about - a three piece outfit over three weeks. Submit one piece each week and on the third week a photo of the whole look together. Would break me out of my dress rut.. and make me think carefully about making separates that acually work together.
Wouldn't have to be the obvious top with skirt/pant and jacket. Could be a dress with bolero and clutch bag for example... or a hat even!
How about all starting with the same straight skirt pattern and then see how you can change it by adding vents, kick pleat, pleated panel, goddets etc (but not all at once :) )
Also making a lined skirt or dress.
Or Playing with Pockets - trying out different ways to make them.