Sherlock Holmes Christmas Theme
Gift tags written like telegrams - business card size/shape, written on a type writer, bonus points if the tag is presented in a mini envelope and attached to the gift with a wax seal
Make the message something like: Watson, I believe this to be the thing you were looking for, Merry Christmas SH
Put riddles/puzzles in the greetings cards for the recipients to solve
Use brown paper and newspaper as gift wrap, find or make ribbons out of emerald velvet, green tarten, tweed or soft brown satins
Tree ornaments could be in sage green, gold, copper, brown, emerald, champagne and black
Paper chains made out of newspapers - paper chains were extremely popular in victorian times, the financial Times makes for some colour veriety
Host a game night where you play cluedo (clue), a murder mystery or an escape room - you can actually download murder mysteries and escape rooms online, there is an Enola Holmes one.
Scented candles of tobacco, leather, cedar
Listen to violin music or violin carols
Dress your furniture with tarten blankets and cushions
Make sure your best dressing gown and slippers are on hand
Serve hot drinks in teacups and saucers
Use glass decanters for your cold drinks
Cold cuts on the sideboard
Tidbits you can keep around - baker Street sign, magnifying glass, a skull ornamemt, map of victorian London, wooden trinket box, playing cards