If you'd like to be home when your kids get home, maybe you should consider a job working for their school district. There are lots of jobs that aren't in a classroom (aka, you don't need a degree) but then you and your kids will have the same schedule.
Most districts have a website with all their job postings.
When I went back to work after my son, I was able to return to my former employer, covering the lunch rush for them 8:30-1pm. It was fabulous! Don't be afraid to ask for what you want. I was certainly surprised at the accomidation they were willing to make to keep me - even part time! It was a win-win.
Get creative, find something you love doing, and have fun! I know having a purpose outside of the house has made me a more purposeful mommy and wife when I am home! I hope it works out as well for you!
T.