Need a color picker in your mobile app? here is one which is easy to use with your thumb and you can use any image as color palette. 

Download the Mobile Color Picker from the OutSystems Forge.

Apart from the module with the widget there is a demo application as well.

Click on the circle to open the color palette:

Move your finger over the image and the little circle will show the color of the pixel you touch.

Have fun, looking forward for feedback.