Some ideas:
Gather blank paper, stickers, markers, rubber stamps, etc. and let the kids make their own stationery for writing thank-you notes.
Let the kids make a tent out of a card table with an old blanket or sheet hung over it. You could even let them eat a picnic lunch inside.
Make a beanbag toss game. Fill old socks partway with dried beans and tie closed with twist ties or string. Cut a hole in a large cardboard box. For older kids, make 3 different size holes and assign points to the holes--i.e. more points for tossing your beanbag into the smallest hole.
Feed the birds. Cover a pinecone with peanut butter; then roll in birdseed. Hang in a tree outside your window so the kids can watch the birds as they eat.
Outer Space: give your kids some big boxes and have them build and decorate a rocket. Eat dried foods and drink Tang.
Spend an afternoon writing letters or making homemade cards to send to out-of-state relatives. Let the kids make drawings, finger paint portraits, or collages to send to Grandma and Grandpa to adorn their refrigerator.
Pull out the teapot and teacups and hold an afternoon tea party. Along with your tea, serve finger sandwiches and cookies. If your children are too young for tea, serve heated lemonade or hot chocolate.
Here is a good basic recipes for homemade face paint:
You'll need:
1 tsp. cornstarch
1/2 tsp. water
1/2 tsp. cold cream
food coloring (paste coloring will give deeper colors, click to order)
Mix cornstarch and cold cream together until smooth. Mix in water and food coloring. Store in an airtight container. Repeat this for each color. Visit your local dollar store or look for store brand cold cream. There is no need to use expensive brands. One jar will make a lot of paint. Mix it up and store in baby food jars or film canisters and keep them closed when you aren't using them.
Make Rainbow Colored Macaroni Beads
How to Color Macaroni
1. Mix 2 Tbsp. rubbing alcohol and 3 drops of food coloring (more if you want deeper color) in a small container and set it aside.
2. Pour 1 cup of uncooked macaroni (Elbow and Ziti work best) in a large Ziploc Bag.
3. Add the colored alcohol to the bag.
4. Zip the bag closed and squeeze the macaroni around in the alcohol for about 2 minutes until it’s evenly colored.
5. Cover a cookie sheet with two layers of paper towels and spread the colored macaroni out to let it dry. It should take about 5-10 minutes to dry thoroughly.
Now your beads are ready to be used. String them on some yarn to make “Macaroni Beaded Jewelry”.
You can also cover a shoebox with colored paper and then glue on some stickers, cut-outs, and your newly colored beads to embellish a “treasure box”. Simply use shell or bowtie macaroni for gluing on flat surfaces. Oh, and don't forget a dash of glitter.
Use this technique to make lots of beads in every color of the rainbow.
Store any leftover Rainbow Macaroni in a ziploc baggie and add them to your Craft Kit.