1. "Drillin', spillin', and killin', since 1891," is a relay phrase for this sticker. It quickly gets across the issue at hand and explains what offshore drilling has been doing since 1891. It works well because it is has some word play and rhyming involved which I believe catches the viewers attention.
2. "This is not a drill," is also a relay message. It plays off an old saying and mirrors the famous "This is not a pipe," poster. Once again word play is in effect here.
3. This is the same message as number two, also a relay. I changed the shape to resemble actual caution or warning signs, or also the chemical identification signs that you see on barrels or back of trucks that might be caring chemicals or harmful product. I like the position of the type because it doesn't really interfere with the main imagery and casually rides the border, sort of blending in with the overall shape.
4 & 5. Both of these are the same as number one but once again thrown into a different shape and with a different arrangement of type. The type change from Helvetica to Avenir was strictly experimental, I think that Helvetica works better though mostly because of its boldness. I also changed up how the main symbol was presented. In one of these (#4) we see the entirety of the symbol, in the other (#5) we see it interacting the shape and touching the borders. I like number 5 more mostly because it fills more space and looks a little bit more like a large ocean instead of containing it to a half circle.
6. This is the same as the number one as well, but in black and white. Honestly I think the black and white work better for these because of its legibility and it just looks cleaner. I think that people will be able to make out the imagery just fine and that color might not truly be necessary.
7. This last symbol does not reflect relay, but anchorage instead. It is straight forward and hard to misread. In a case like this I definitely think color is not necessary because even if the viewer does not get the imagery right at the start, the anchorage reinforces the imagery and once they read the text they will be able to put together what the imagery is.
Overall concerns: I don't know if people will get that the imagery is made from sand or if it's just a weird photoshop grain filter. Also my type is lost once the symbol is downsized, after messing with different weights and typefaces it still seems to get lost.