Googling "Independence Day word search" will bring up any number of printable worksheets, and they're great, not only for spelling practice, but also for setting a patriotic mood for the holiday. Worksheets in the summertime though...well, there's nothing fun about that.
I suggest placing your wordsearch somewhere unexpected:
- a chalkboard, or with sidewalk chalk on the patio
- written in window markers on glass doors or windows
- set out in fun foam letters on the floor (you can use your finger to "draw" circles around the words on the carpet)
- or in frosting on cookies (think white sugar cookies squares, with red letters, and blue frosting ready to be piped, on the side, for circling letters).
Like I said, it's simple, but effective - and too much fun to overlook.