Actually guys, the link Mageshadow posted on the Blog (the one to the Consortium forums) has an item about craftables that disenchant into these.
For some reason you can't start at these in wowhead and find the craftables that disenchant into them (thottbot used to have this, I loved it bigtime
Just remember to put it all in a spreadsheet to see where (and if) it's profitable to do.
Yes you can...Large Brilliant Shard
The first tab is called "Disenchanted from". Then it's just a matter of running a filter. Here, let me play around a bit...
*Compiling...*What craftables disenchant into LBS?
Greens have about a 5% chance; blues have about a 100% chance. As always, armour has a greater chance of turning into Illusion Dust and weapons have a greater chance of turning into GEE.
As for drops, just head to UBRS, LBRS or the second half of BRD for boss drops to DE - if so inclined.
Just remember how amazing Wowhead actually is. The filter system works wonders.