Cinco de Mayo is a celebration of the Mexican army's victory over French forces at the Battle of Puebla in 1862. It's not typically associated with gift-giving, but why not? Here are few fun ideas.
Muchas Gracias tag can be found here.
Margarita? Yes, please! Tag can be found here.
Impress your coworkers with a festive gift! (That is, if you really like them.)
Tag can be found here.
This would pair beautifully with some Nacho chips :) Tag can be found here. I even have an editable file of this tag. It can be found here. There is a demo link in the description. You can edit the text but not the graphic.
Want something FREE? I can't give you the tequila but I can give you this tag for free. It can be found HERE.