I'm so sorry about your kitty.
They truly are angels with fur.
I'm not sure if this will help much, but we did something cute in the bathroom when we added our second floor. I have three turtles that I love, so my hub added something personal to the bath..
He used bathroom grout, and regular tile sealer like the kind you find in Home Depot and Lowe's or a local hardware store. I'm sure if you look in craft stores you can find colored grout, I've seen it. I got Fiiberglass Mosaic Mesh from Di Mosaico, but you can also find some at Dick Blicks or other art supply stores...
The process is straightforward...
First place the tiles down on the mesh to get an idea of the design, then glue into place with Weldbond. Grout and seal.
Hope this helps!