Here's a great "stuck-at-home-because-of-smal
Read a book together:
Motherhood can be one of the most fatiguing jobs. When the children are little, her job isn't 9 - 5.
She not only takes care of the little ones 24 hrs a day, she usually takes on the additional chores of attending to her husband's needs.
What she needs - is rest.
Put the kids to bed early, lock yourselves into your room, cuddle on the bed and read a fun book together. Some recommendations would be a good biography of her favorite celebrity, or The Lord of the Rings books or whatever sort of story you both might enjoy. I suggest picking something weird or fun, or something you've never read about before. It makes for great conversation and that's the whole point. Even scripture stories would be a good read, and spark some discussion.
One caveat here - unless she is in the mood for it, try to avoid any books about improving your sex life (or improving anything, for that matter) - this may make her feel pressured to act when she just wants to relax, clear her mind and bond emotionally with you. Ironcially (to us men) this can actually get her in the mood to be sexually intimate. She has to mentally make that decision, and that's an easier decision for a woman to make when she feels emotionally closer to you.
So, it's best to avoid topics that would have her associate sex, or time with you, with "chores". Now is the time to relax and enjoy the other's company. If sex happens, that's a plus but shouldn't be the goal here. If it will help you relax, it's okay to request a quickie, but let it be her gift to you. Let emotional intimacy be your gift to her.