Try letting the solution evaporate in an open dish. Check it from time to time and you should see crystals appear in the bottom of the dish.
I've never tried this with zinc chloride in particular, but have had good success with other chemicals, such as alum, copper (II) sulfate, potassium ferrocyanide, sodium chloride and more.
Once the crystals are of a suitable size, you can pick them out of the solution (use tweezers!) and let them dry, or tie them to a thread, suspend them back into the solution and let them grow. We have obtained alum crystals up to a few kg in mass this way!