Geometrical cutouts.

Hello! Some days ago I've done my first tries of painted papers using the printing technique as you can see on these posts:

Printing experiments - part I

Printing experiments - part II

I used some geometrical cutouts to produce masking effects in the layering process. I thought throw them away... But then I decided to sotre them for future applications. Well, the purpose of this post is that I don't know how I can use them! So, I will be glad to read your suggestions! Please tell me some ideas to reuse them!! Thank You all in advance!