I guess this is something we never give a thought to, but there are rules about what senators and house members can't bring into their floors.
Because of Illinois Senator Tammy Duckworth's new baby coming shortly after she won the election, the long standing rule in the senate which forbade babies was changed. In the senate only children under the age of one are allowed onto the floor and that is only babies of actual senators. In the House children of members of any age are allowed onto the floor.
The senate has a flower rule. No flowers allowed with one exception: in the case of the death of a senator, the majority and minority leaders can decide to allow a flower display on his or her desk—but only on the day eulogies will occur. The House has no such flower rule.
No food or beverages in either the House or the Senate except for water. The Senate will also allow milk.
No portraits of individuals who died less than 25 years ago.
Hats are forbidden in both chambers, hoods were also barred in 2012. This goes for not only members but people in the gallery although they do allow women in the gallery to wear any kind of hat they want.
Senate rules state that if a senator is wearing pants (not dresses or skirts) he/she must also put on a blazer. the House only states members must wear appropriate attire.
In the Senate all personal electronic devices are no allowed while the House forbids cell phones and laptops, but okays a tablet.
Spitting is not allowed in the House nor is hissing or coughing. This goes back all the way to Jefferson who wrote that rule. The House does not mention anything about spitting.