Writing Wednesday: Need Your Help!

I know you all have been enjoying the Mosaic series, but all stories are finite. So after I'm done/fed up with the Mosaic series, I'll need something else to do. That's where you come in! Once I finish up the current series, I'm gonna start a new one. I'll give you a few options, and you guys pick! Here are some things I've come up with so far:

• The Journey - a medieval series involving four to five main characters who intrepidly journey through many amazing localities to discover the alleged Spring of Life. Main characters: a young, naive, adventurous young boy, a gruff, burly hunter, a young girl to is revealed to be royalty from an exterminated blood line, a zany alchemist who can actually turn anything to gold, except the effect lasts for only a few hours and a sour old nanny goat. 
• Coppertown, Nebraska - a series centred around a boy living in a small town who wants more out of life. Could be a mystery series or a series more like Mosaics. 
• The Crossover - a complex science fiction series. Two main characters find themselves in two completely foreign timelines, a 21st century kid finds him/her self in the medieval era while a 30th century child scientist struggles to return the lost boy/girl to his/her appropriate era.

 I may end up doing all of these (eventually. maybe.), but you guys get to pick which one I should do first. And if you're feeling really creative, you could suggest your own story arc. Please feel free to comment and take your pick.