Check out Westminster Ceramics -- I believe they have something similar.

If that doesn't play out, you could 'frame' a 2x2 Tantrum with some 1/2" liners to build it out to 3x3. Or use a cluster of smaller or larger Tantrums in a focal point center medallion.

Hope you get some more answers, I'm interested too. Unfortunately, I think Westminster Ceramics is gone....

Georgia Bankruptcy Blog:
http://www.georgiabankruptcyblog.com/archives/northern-district-cases-westminster-ceramics-llc-files-chapter-11-in-northern-district-of-georgia-will-liquidate.html

Here is a link that might be useful: bankruptcy discussion on GW

Yes I went today and WC is no longer in business. I surely need to find something quickly!

Bummer! They had some lovely tiles. The green tiles in our bath (including the scrumptuous arched tiles) are Westminster --

Check out MarinDesignWorks.com

They have several textures in glass tile that are similar to the Tantrum line and do custom cutting according to their website.

Good Luck!

You might look at Encore Ceramics--the San Marco line.

You might want to check out Billabong crackled glass tiles. They are very similar but the 'frame' seems to be smooth and maybe a shade whiter than Sonoma. (It works really well with our travertine). Not sure if there is a distributor in your area.

Here is a link that might be useful: Billabong glass tile

Someone pointed me in the direction of Seneca Tile, Glassic.

I have a local dealer who is getting in a sample for me to see....I am beginning to wonder if it will ever appear though.

I can't figure out where that Billabong glass tile can be purchased from their website.

Here is a link that might be useful: Seneca Tile Glassic