any cute themes for an open house

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So my open house is kind of coming up. I'm not really sure on what theme I want, but I want it to be cute, and a summer type thing. I was thinking Hawiian or something, but do you think there is anything cute? Any idea's please? For my cake I was going to have a picture of my friends and I at prom, and put it on there, is that cute or no?