Some interesting and compelling artwork, Corey. If I were you, I would use the grafiti piece as my logo. It is the most legible of the three and has the most dynamic composition. Try using it with different backgrounds and/or colours and see what you come up with.
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I would add a blur and a layer mask to the graffiti layer (or group of layers) so it will be more realistic.
I supose the blur has not secrets for you. With the layer mask and the 'render-clouds' + 'render-difference clouds' , you can give the graffiti itself a 'almost random' transparency effect.
Do you know how to make it? Backup the graffiti layer (or group) by copying it (you would want to hide it too). Then merge the group (or group the layer and merge it so the effects you're using are applied at all). Create a layer mask for this layer. Use the render-clouds once with the default fg/bg colors (i.e. white and black). Use then the diff clouds twice or more. Finally, adjust layer mask brightness and contrast and layer itself opacity.
Furthermore, if you change tha layer blending option to 'Overlay', although it will lose colorful, it seems better to me, more pro.