Please dont get a corporate logo. I have seen far to many of those, and its not like you are getting paid for it.
When it comes to my tattoos they have all been original. Going in and picking some flash off the wall ensures that someone else has that tattoo and it probably wont be fun for the artist to do.
Most reputable tattoo artists will have entire portfolios of drawings that they want to have people get tattooed. Pick a shop that is well known and dont be afraid to pay good money. Lots of my freinds have gotten tattoos based on "whoa man I can get this half-sleeve for $350!" and 6 months later they realize that the tattoo looks like garbage. To get them done right its going to cost. (Dont forget, its only going to last until your skin rots off...and laser surgery is expensive.)
Look into family history. Were any of your relatives involved in a war? how about your ancestry? where did you come from, can that be incorporated into your tattoo? Past pets, loved ones etc. All good ideas. If you get a tattoo that has no meaning behind it though, make sure its quality work!
(Just my 0.02)