A plethora of hostess gift ideas (click collage to enlarge):

*Chalkboard Candle - perfect for combining your note of thanks with your present, $22
*Marimekko Pisaroi Umbrella - cute for a "shower" hostess gift, $40
*Red Flower Yuzu Mimosa Sea Algae Body Wash - soothing smell and super moisturizing, $28
*Pangea Organics (I heart this Boulder, CO-based company) Pyreness Lavender with Cardamom Lip Balm - my fave lip balm, $13 (is much larger than most balms, which justifies the price point)
*Pangea Organics Oatmeal with Italian Bergamot Bar Soap - another cute idea for a "shower" gift, $8
*All natural Roll-On Oil - available in birthstone & other gem/mineral scents (also great if you have multiple hostesses and want to give the same gift but with a personalized spin on each), $45 (my faves are pearl and peridot)
*The book, Chocolate and Zucchini, makes a great gift for the hostess of a dinner party, $13
*5-piece Bamboo EcoTools Brush Set - super soft & environmentally friendly, $11 (can also be found in-store at Target)
*D.L. & Co. Miniature (1oz) Glass Scallop Pink Pepper and Absinthe candles, $33 (another great idea for multiple hostesses)
*Dogeared Love & Abundance sterling silver necklace, $72
*A really special idea is to send an arrangement from a local florist the Monday after the festivity. This lovely arrangement is from Jayson Home and Garden in Chicago.
*Another great idea for a dinner party hostess is an artisanal salt from Dean & Deluca (or any other gourmet food store), $22-28