Sometimes the only thing left to do is cry. Rage against everything. What you need is within you and tears are the pathway that knowledge flows on. Even if there is no sudden idea, you'll feel better.
I used to keep a journal with "this too will pass" written on the front. Everything that got me down went into that journal and just knowing that as huge and horrible as it all seemed at the time, those words on the front stood there as a promise about whatever I put inside.
Do your kids play with dolls? I used to make lots and lots of clothes for my kids to dress their Barbies and GI Joes with. Maybe not the height of creativity, but satisfying for all of us and not a huge material-user.