well its time for you to branch out and learn some cast on's!
there are LOTS of different ones
there is Long tail (and about 10 variation of long tail!)
there are simple cast ons.. (including just spiral wraping the yarn around the needle!)
there are tubular cast on's (invisible cast ons)--and at least 4 ways to make one!
there are knit on (KNIT AND CABLE are the biggies, but there are variation of those too!
there One of kind (Channel island), or the hairpin lace one--(knitted hairpinlace)
there are crocheted cast ons 1-where you use a crochet hook and make loops over the needle (and then start knitting)
and there Provisional cast ons (temporary cast ons, that will be undone -a crocheted version is one of the more common ones)
there are noose/eyelet cast ons for starting shawl or hat from 4 or 6 or 8 stitches. (these cast ons start with a big hole, but the tail gets pulled and closed up like a noose, and makes a small eyelet
there are all sorts of 2 needle cast ons.. (eastern/turkish/figure 8, magic ) are all versions of this style.
there are multi colored braided cast ons.
i know 40 or so cast on's (and i don't know them all!) in this past year, i've learned 2 new ones!)
want to know more? google, or start here and read a 4 part series (there are links to the next part at the end of each post) about cast ons. page 4 is a collection of links.. and references.