‘I need help with leaving card etiquette’

I feel a bit sheepish about submitting this as a problem but I am getting increasingly weary about having to sign the birthday and leaving cards that are brought round my office all the time. Other people write funny things and add kisses but I can never think of anything original to say, so I usually write “good luck” or “happy birthday”, and I don’t include kisses as I don’t kiss the person when I see them. I also never know how much money I should put in the envelope. For a birthday for a colleague I don’t like much, I only put in £1 but then feel mean. Are there any rules to make this odd process easier?
Accountant, female, 31

Dear Lucy

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Lucy Kellaway, FT columnist and associate editor, offers her solution to your workplace problems in a fortnightly column in the Financial Times. In this weekly online edition of her 'agony aunt' column, readers are invited to have a say too. Read more about Dear Lucy here.