Pinterest again gave me tons of ideas, so head there after here if you're planning a Lego party yourself.
You'll have to excuse my amateur photography below, but that job was assigned to my husband that day and he did the best he could.
Super simple and cheap! I cut up vinyl table cloths in rectangle shapes and taped on coordinating colored paper plates for my backdrop wall. They ended up looking like giant Legos and took barely any time. Other than that, I stuck with primary colors. I found that I'm able to reuse lots of items over and over again for parties that are primary colors which is great when I have extras of things left over.
I just had chips, veggies, and pizza for the boys along with cake and marshmallow pops. I can't do a successful crumb coating to save my life, probably because I'm not patient enough to let it set, but the cake turned out pretty cute I think. I used THIS video as a tutorial and guide.
I specifically bought yellow cups and allowed the boys to draw their own Lego faces on them. They loved this idea too.The punch was just frozen limeade and cranberry Sierra Mist with some sherbert added. It did the job of wiring up the kids perfectly.
*Disclaimer - You can see the details here, but I implore you to make the host of the party aware if your child has a food allergy.
Besides the faces on cups, I had 3 other games. Yes, 3, however they were super simple and not time consuming at all.
1) Guess how many Legos- Alex loved prepping for this by counting out 176 Legos by himself to put into a vase. As guests came arrived they just wrote their guess on a slip of paper. The prize was a small Lego set.
2) Lego Memory Board- Alex also helped prepare this by gathering some distinct Lego items and putting them on a large green Lego plate. I let the kids look at the board for about 30 sec.-1 min. before covering it back up and they then had to recall what the objects were. The adults helped them write, but the game seemed perfectly aligned with 1st grade skills. I was surprised at how clever the winner of this game was, he actually drew a small picture of each object versus writing down the word and he got them all! Again the prize was a small Lego set.
3) Lego Punch Box- The punch box seems to be a popular party pin idea and I used it to fit my theme to make it look like a Lego. I had 8 holes, 1 for each guest. I used an old diaper box, cut 8 holes, and wrapped it up with a vinyl table cloth that matched tissue paper I had. Then I configured the inside with shelves made of more reused cardboard lying around in my recycling bin. I then applied tissue paper over each hole. Behind each hole was a small Lego set they got as their favor. They punched out a hole and claimed their prize as they left the party. As you can imagine this was a huge hit with the kids. And as a bonus, we kept the box as a Nerf target for the boys.
I know Alex really enjoyed himself and it was so cute how he kept showing off all the stuff that we had planned out. I could tell he was really proud and pleased, which of course makes all the chaos worth it for me.
The only tip I'll leave you all with is that if you know in advance you're doing a Lego Party, scope out deals on Lego party favors. I got some that were on clearance and on sale and made it worth the investment to get every guest a small set vs. junk in a goodie bag.