you seem to be sorted for your Mum. For your Mother in Law I would consider Freedom Fabric. The are a UK company but I know also sell in the states. Their colours are outstanding, the blends and co ordinating fabrics beautiful. I am a big fan of theirs for something classy and great quality.
http://www.fabricfreedom.co.uk/index.html
I would particularly look at deco dance 2
http://www.fabricfreedom.co.uk/decodance2.html for fabulous rich reds and oranges with designs based on Clarice Cliff.
Or a real favorate of mine Pure Velvet
http://www.fabricfreedom.co.uk/purevelvet.html which has divine sweat pea and lilac prints and lovely blenders. Tales of the Riverbank has water lillies and irises.
http://www.fabricfreedom.co.uk/talesriverbank.html
I use their perfect pallette for blenders and poppers all the time.
As for a pattern, to show off amazing fabric like those above to its best I would do large simple blocks. I would suggest a square within a square. Easy, fabulous with dramatic fabric and look very classy and luxurious.
Ps
They have excellent free to download patterns to go with each fabric. I love the very simple but out standing one for Tales of the Riverbank