These are absolutely amazing, thank you! Our group is just starting to explore VTT and the quality of these will very much help sell the concept I suspect. I started looking through your paid sets and while a bit overwhelmed at the sheer volume of work, if the VTT thing sticks, I can see exploring some more complex layouts using those. Thank you again for releasing these!
Yup anything in my free folder can be used for projects if you like. My commercial (thus not free) stuff is in my roll20 folder. Though you can't use them to compete with me by reselling them as is as an art pack that's dirty pool.