How can I hide the colored plus signs on my texture? How can I hide the colored plus signs on my texture?
I have these colored plus signs appearing on my texture/model. 
I haven't figured out a way to hide them.



The blend file:
I edited your scene so it is ready to paint over the UV grid texture to the new texture (called "stairs").
I basically added this extra texture for both materials and set the texture int the paint slot (left toolbar).