
You have all these great ideas, no money, and know your target is at the street level... sounds like Guerrilla, specifically wild postings. Wild postings are any type of poster that is plastered to a lamp post, brick wall, bulletin board, really any flat surface. It is important to know that these can be done on many scales; its not necessarily just a 11 by 7 poster. Based on your target, and where you are trying to reach them,different sizes and methods are used. Choose with caution in order to maximize your desired exposure. That said, in some cases its really not the size that matter, its what you do with these wild postings. All wild postings fall into two distinct categories: with permission, or without permission.
Wild postings
without permission are for those that are true guerrillas at heart. That said, it is not always the method most encouraged. There are many risks with just going ahead and posting things where ever your heart desires. Some may think that the risk is worth the exposure, but is it worth tickets, fines, and written letters in your mailbox with less than appropriate language? It may be tempting to just post your material where ever you want, permission is a pain, but be aware that there could be some serious consequences.
Wild postings
with permission on the other hand are the safe way to go for guerrillas that tend to take a little more caution. Permission is a hard thing to get. Although this method of wild posting is probably the best way to go, you may need help if you plan on getting permission. Sometimes the best way to do this is through an agency or wild posting vendor. The benefit of this is they already have locations that are pre-approved. By going through a vendor, a few painfully long steps trying to get permission yourself will be eliminated.
Wild postings are a very important part of guerrilla marketing. AND if used correctly you could use this street level approach to get in the face of your target market while getting a lot of exposure.