Quote - If you make them tilable they'll have more commercial value.

Or another thing u could try, if you're going for making high quality texture resources that will have high commercial value; and this is something which could be highly usefull buy has strangely never been done as far as i know...

You could try to take various rather neutral photo's of different locations of the same surface, so that you can  easily blend them and create textures for larger surfaces without having them look to repetitive.

Then supply photo's of more intense characteristics or distressed area's of the same type of surface seperately.

So you could have like, a number of photo's of asphalt, and then a few of different lines or other signs on tarmac surfaces, which you can then very easily apply to your base asphalt textures in photoshop wherever needed.

Same could be done with brick surface, & cracks in a brick wall. paited surfaces and various paint cracks, dirt and a collection of stones or sticks that might lay on the dirt surface. etc.

Kinda a "make your own photo quality textures" kit

 

i know this is a stupid question, bear with me, how exactly do you go about making something tileable???