CREATE PATTERNS inside of shapes in Adobe Photoshop
1) If you want to learn how to create photoshop patterns check out the "how to make repeating patterns in photoshop" tutorial
2) Open a new document with dimensions 51.9 cm x 30 cm
3) Go to the layer menu, scroll down to 'new fill layer' and then click 'pattern'
4) In the pattern options panel pick the pattern you wish to use from the drop-down menu, then use the slider to scale it until it looks right.
5) Now place the shape you want to put the second pattern in.
6) Right click the layer containing the shape and click 'blending options'. in the menu that comes up select the 'pattern overlay' tab on the right side.
7) Finally pick the pattern you want to put in the shape and scale it with the slider, then hit ok. Have fun!