Can your husband do any woodworking?
My dad made wooden train marker holders. If he's not that great at woodworking-he could do a block one.
Have him drill 8 holes in a block of wood - the diameter needs to be the same as the marker lid. He used Crayola. Make sure to leave some room between the holes so that the kids can pull the markers out. Hammer the lids of the markers into the wooden block gently. The lids should stay in the block and keep your child from loosing them.
How about some make your own crafts for the older children. The dollar store has some little wooden boxes. Add some paint, painbrushes, stickers or confetti to decorate the box with. You could also do photo frames.
I made a game with the wooden boxes from the dollar store. I purchased 5 of them, glass pebbles (treasure) and a dice. Put the treasure in one of the boxes and then give everyone else a box. Everyone takes turns rolling and collecting the treasure from the center until the treasure is gone. Then have everyone count the treasure in their box.
Another fun game: I Spy Bottle
One empty waterbottle with lid, rice and lots of small items (confetti, penny, hair clip, buttons, beads, dice, small toys, etc). Alternate the rice and the items in the waterbottle. Leave room at the top so the items can move around in the bottle. Hot glue the lid and then play I Spy.