Lego Party

Every boy will go wild for these Lego invites. Build a Lego board that reads “party” with your child’s Legos then take a photo of the blocks. Upload the photo onto your computer, choose a Lego-esque font and place the text onto the photo.
Source: brendid.com

Outdoor Party

Perfect for a pool party, these watermelon invitations can be printed from clementinecreative.co.za for free, and cut into a watermelon shape by following the provided lines. When you download the pdf, you can also place the text you wish inside.
Source: clementinecreative.co.za

Spa Party

For a spa party or spa sleepover, invitations shaped like sleeping masks compliment the theme perfectly. Print them from the pdf on the website, fill in your own party information and glue to cardstock shaped like the masks.
Attach ribbons to the backs.
Sources: darlingdarleen.com, onecharmingparty.com

Princess or Fairy Party

Wand invites can be used as a toy or costume accessory after the party. All you need is colored cardstock, wooden chopsticks and a glue gun. Print your party information directly onto the cardstock, then cut into a star shape. Glue them on the top of the chopsticks, and if desired, add glitter around the edges.
Source: danyabanya.com

Monster Party

Take brightly-colored cardstock and googly eyes to make cute, colorful monsters for a fun monster bash. Cut out the mouth with black cardstock, or draw it straight on the monster, and print out your party information to glue on the back.
Source: simplisticallyliving.com