These databases access the journal literature for Art and Design.
Business databases often are a useful source for researching brands, corporate identities, and logos. Design and Applied Arts Index will cover a broad range of design topics, but consulting Art Full Text may also generate additional sources.
The Cooper Hewitt Collections at the Smithsonian Design Museum is a great collection which encapsulates over 300 years of design artifacts. The collection is easily searchable by color, time period, object size and a variety of other aspects. This is a fun resource to play around with and find some great artifacts in historical and contemporary design.