I don't know if something like this will work for you, but it's one way of getting somewhat more organic looking roots.
To get this:
1. Make the basic component (the bulb) however you choose to do it.
2. Choose the bulb component and open the sculpting tool
3. Choose the Smudge tool. Set the diameter low and the strength high. Turn OFF "Preserve Transparency"
4. Grab the bottom of the bulb and pull down. You will get tendrils that will naturally taper down. You will also get some smeary stuff around them. Don't worry about it.
5. Make tendrils until you're happy with it.
6. Do a little smoothing or additional sculpting as needed
7. Close the sculpting tool. Go to the 2d View tab
8. Click on the edited bulb to choose it.
9. Open the Trace Bitmap tool on the Drawing tab
10. Choose "Color" tracing. Choose all the colors except for the 2 on the top left. This should choose the entire bulb and tendrils but not the smeary area.
11. Click Preview and Apply to create a vector
12. Close the Trace Bitmap tool and select both the bulb component and the vector you just created. Use the "Clear area of selected component outside selected vector" tool to delete the smeary area.
This works for hair, too.
D&S Artistic Woodworking http://www.dsartisticwood.com