Shower favors are not a tradition in all areas. In some regions, it is unheard of give favors (they came to shower the mom, not vice-versa). Yet in other regions, it is a must (it is rude not to acknowledge their presence with a favor). It's best to base your decision on what you have experienced at showers you have attended locally or ask close friends and find out what they think. If you do have favors, some ideas are potpourri satchel, scented candles, or candies wrapped in tulle.