Anybody got any hints on music composition for short pieces.

I have to compose and perform two short pieces of about 1 min each. They are to go with two short new videos.

It's just they are so short, it's difficult to develop a theme!

I was a bit nervous about doing it, so selected two short videos, but after improvising along to the, found it quite intense, whereas a longer piece would have perhaps left more room to build on!