That's a wonderful idea!!!
They are so easy to make and you can start now to shop around for different types of fancy bottles to use!
Be sure to tell everyone that herb-infused vinegars can be used in place of vinegar in any recipes as well!
As a baseline for proportioning the herbs, use three or four 2 inch sprigs of fresh herb per cup of vinegar. If using dried herbs, use 1/4 cup of herb per cup of vinegar. If using garlic, hot peppers, or something similar, use 1 garlic clove or 1 pepper per cup of vinegar.
Place the herbs in clean jars or decorative bottles. Gently heat the vinegar, but don't boil it. Let it cool down, then pour the warm Vinegar over the herbs in the jars. Place the jars in a dark place, such as a cabinet or shelf away from bright windows. The vinegars can be used in 3-4 weeks to up to a year later.
If you prefer to start out simply, you can make single-herb vinegars - below is a sampling of some herbs and the appropriate types of vinegar to try. This is not a complete list by any stretch, so do experiment on your own once you are comfortable with the basics.
White Wine Vinegar goes well with Borage, Chive, Dill, Savory, Sage, Opal Basil, Lavender Sprigs or Flowers, Fennel, Parsley, Rosemary, Tarragon, Thyme, Garlic and Onion Stems & Blossoms
Red Wine Vinegar goes well with Basil, Garlic, Oregano, and Thyme.
White Vinegar is complimented by Basil, Rosemary, Tarragon, and Dill.
Cider Vinegar is enhanced by Lovage, Orange Peel Spirals, Raspberries, and Lavender Blossoms.
Rice Vinegar goes well with Parsley, Dill, Savory, Sage, Rosemary, Purple Basil, Tarragon, Thyme, and Garlic.
Hope this helps!