Using Grout

I have had a go at grouting button onto the back of tiles.
I was inspired to do this by our trip to Barcelona and seeing Gaudi's work in Park Guell...

And also my artistic research - http://www.flickr.com/photos/52485363@N08/

Rough Grout:

 Smooth Grout:

I really like the way these experiments have turned out and I would like to somehow use this for my final piece.

I think grouting my original idea of picture frames, this will also display my collection along side what I will be framing.