A VERY VERY Budget At Home Reception

So here's the thing. We have about $4,000 to spend on our at home reception. Out of that $4,000 we have to purchase food for the 200 people we are inviting, pay for rentals (tent, tables, chairs, etc) and still have enough money to decorate the Meerkat In-Laws backyard with. *deep breath*

I am hoping that we can pull off a bright colored, whimsical-chic, backyard, love story themed shindig. Here is kind of the idea we are going for:

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Yea the budget is going to be tight but I know we can do this if we are smart about how we spend the money. The bad part is I have high standards and I want everything to feel/look luxe even if it's not.

On top of the budget constraint I am struggling with the fact that our reception doesn't really have a theme outside of "our love story". While I am going to tie together all the food, favors and photos into the "our love story" theme, I am still going to need bold, colorful, cost effective, visual elements that tie the whole party together.

Here is what I have so far. Beside using our big pink heart above as a design element I think I would like to use chalkboards signs with colorful chalk.

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Big, bright, tissue poms on the tables and around the yard:

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I would also like to take the poms and do something like this in the roof of the clear tent we are getting:

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Or maybe some of these mixed in:

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I know the vision I have is still a bit raw but all the items are cost effective and have that colorful impact I am looking for. I really need to decide in the next couple weeks how we want to progress so that we can get projects started. *deep breath* I am trying not to panic.

Are these enough design elements to pull it all together? I would love to hear what you would add or take away if this was your very, very budget reception.