It's a very nice little web app by the folks at Inkwell Ideas called Coat of Arms Design Studio - it requires Java, which may mean a little downloading, since the yawning great security hole in some recent versions has stopped Apple (among others) from enabling it by default.
Once you've got it working, the free version is pretty neat - you can place almost any kind of charge from its library on any background, and then export the results. The pay version adds the ability to import images, and a few extra tweaks.
If you think you've run across Inkwell Ideas before, yes, you have - I supported their Kickstarter for their Cityographer mapping product a while back.
Which just leaves the answers to last time: if you recall I asked you to identify three partial blazons and where they came from.
- Gules, three lions passant guardant in pale or, armed and langued azure. - is, of course, the Royal Arms of England
- Or, a lion rampant gules armed and langued azure... - is the lion on the arms of Scotland
- Gules, a bear erect argent, muzzled of the first, collared and chained or... - is the bear (without its ragged staff) from the arms of Warwick.