Zumo is right. the best thing to do is show a wide rage of stuff. Depending on the college and where you are applying they will be looking for different things. However being a school they are looking to see that you are trying new things.
Yes, it helps if you have some basic technical skill such as photoshop but, they can teach you that, what most schools are looking for are people that will try different things and experiment with ideas.
Having said that, your signs are all very similar products. If you have drawing or paintings or photos ect... I would try to be diverse. But again all this depends on where you are applying.
I think the Global Gatherings one is particularly strong.
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This is simply my opinion...
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