Take a break from Video Games this Sunday! It's Mother's Day! And remember, your wife will expect the following (even if you do not have children, this should apply):
1 flowers (Must)
2 a treat
3 a favor (extra chore from normal)
4 some embarrassing creative thing like a poem, song, drawing, etc.
5 a card
6 your spare time all day
7 a simple (or elaborate) gift
Personally, I think you can get all of this for $15 (Single rose, small chocolates, make your own card, small gift), but if you have the money, by all means, go nuts.
Enjoy Mother's Day!