This is probably a "dead thread", the OP has not logged in, in many years.
Ilex glabra, inkberry is related to and very similar to Ilex verticillata, winterberry. Both are deciduous. Ilex glabra is deciduous and has black berries, where as Ilex verticillata is also deciduous and has red berries. I don't have any photos of Ilex glabra as bonsai, though I know it is occasionally used. Attached photo is of Ilex verticillata, a tree that is part of the Milwaukee Bonsai Foundation permanent bonsai collection housed at the Lynden Sculpture Garden, in the northern suburbs of Milwaukee, WI. The tree in the photo is roughly 12 inches tall and had been landscape material, harvested for bonsai use more than 25 years ago. Originally owned by Michelle Zimmer.
View attachment 337963
The difficult part of using Ilex as bonsai is getting the caliper, or diameter trunk you need to make a convincing "tree" image. The trunks of Ilex are slow to increase in diameter. Ground growing or growing out in large nursery containers for a fair number of years is needed to get a decent trunk. Harvesting old landscape material is the better source for these rather than shopping younger specimens from nurseries.