Quoting CassieB0825:" I have been very desperate myself, due to my curved spine and constant pain mixed with BH contractions ... [snip!] ... do anything ). So you can try all of these things but in the end if your baby isn't ready you will be waiting too. Sorry..."
Castor oil is dangerous, and any contractions it MAY cause are generally just because of dehydration from having the flying smurfs from the castor oil. The rest of these can help, but if labor isn't already on the verge of happening on it's own, it's not going to happen. The only sure bet, is time.