I collect the ones just to the right in the back of the center one. It has a red lip and grey or black accents. It's a modern piece from Mexico (and frequently have bird or floral motifs). I believe it's from the Tonala region of Jalisco in Mexico. I think that they're frequently picked up as souvenirs and dumped off at thrift shops or rummages (which I where I find mine). They are hand-painted.
I frequently pay about $2-5 for ones and have even paid as much as $12 for huge or very ornate versions. I also see them in antique malls and whatnot, usually for about $10 for ordinary ones but they do seem to sit and don't sell too well.
The winner is the black carved piece in the middle. I has Hopi iconography and would really rare if it is Hopi. The figure on the bottom of the pot is a Sun Face Kachina dancer. The other decent piece is the one with the lines to right. It should be a Acoma line pot. These are relatively difficult to make. The tighter and smaller the lines the more valuable the piece.
The rest depend on the maker but I think they may have only nominal value. A few look like Mexican pieces. Look at the bottom of the pot. If it is pencil signed its older. If its signed in black ink then its a modern piece.
That's all modern or contemporary Mexican, southwestern pottery in Navajo, Acoma and Pueblo styles. Personally, I stay away from it unless something catches my eye. The large double wedding vase with the Kachina is the best piece and would catch my eye for the right price. I would almost bet money that it was made in Laguna New Mexico and is signed. Avoid the rest of the pile.