I went through a few different 'saying' ideas. I thought that I probably shouldn't put "You don't suck" on an elementary school Valentine, so I decided on "I'm a sucker for you".
And, the great thing about these Valentines is that you can use any kind of sucker you want. Hello, cheap Dum Dums! Ha!
You can print these out on normal printer paper like I've done here, or print them on colorful cardstock. The sky's the limit! Well, I guess the capacity of your printer's the limit. ;) I've provided a PDF and a jpg, so you can use whichever works best for you.
Need more Valentine inspiration? Then you might like last year's Valentines!
Other Valentine goodies: