This year we leave for WDW on Mother's Day so I'm giving my mom a card on the plane one from my boys and one from me and my brother. My bro and i booked her a pedi spa treatment for SS halfway through our trip. My bro surprised me and added the ressie for both my mom and me.

So in the card I'm gonna tell her about the spa treatment.
In past years....I made her a special small x-mas tree to hold only her fav ornaments, which she collects a certain kind. I decorated the tree with ribbons and even bought a little tree skirt for it.
Another year we surprised her with a special BINGO night (she loves bingo), the whole family went with her to her reg game, my dad, my bro, and me. Granted it was like watching paint dry for me

, and my dad kept complaining that he's not a potato (doesnt have 20 eyes, cause of how fast they read the numbers..

), my mom loved it thou.
You can also do the standards..dinner at a nice restaurant, flowers sent to her door, a special trinket she had her eye on, a box of candy.
Good luck and let us know what you go with!
