Here is a selection of tiles I just took out of the kiln. This particular group was made with a dark brown clay I love the look of, Standard #266. And I love this new (to me) blue underglaze from Speedball, Medium Blue.
An interesting thing, too, about these tiles – they have a bit of a sparkle in the clay. Every box of clay is slightly different, of course, but this has not shown up for me before. Maybe some mica in the mix? I like it, and people have remarked on it.