7. In the Layers Palette, click again on the “Create new fill” button and select Hue/Saturation. Now play with the values on Hue and Saturation until you get your desired color.

8. Then select again the Rectangular Marquee Tool and make a selection on the next shape and apply again Hue/Saturation, this time with other values. Repeat this with all your shapes. Here is my final result:

9. If you don’t have a white background and only want to change the color of one object, instead of Rectangular Marquee Tool, use the Polygonal Lasso Tool and make a selection around your object and then apply the Hue/Saturation. After that, you’ll see in your layer there are 2 thumbnails. Click on the right one to activate the selection. Then move the selection over the next object and apply the Hue/Saturation. Repeat with all your objects. Here is an example: