The one I designed for my friend had a princess crown printed onto pink shimmery paper(used to make cards as a hobby lol) and then personalised to each child.
Something like
Princess (birthday girls name)--------------
would royally like to invite
Princess (friends name)--------------
To an afternoon of pampering at (party venue)-------------
The princess party will commence at ------ until ------
Please RSVP to(birthday girls details)
-------------------------------------------------
Consent (adapt accordingly)
I (parents name)----- consent for (friends name)------ to have there nails painted and gems applied to the nails, cuticle oil and hand cream to be applied.
Signed ---------------
Dear parent
I am a fully qualified nail tec/beauty therapist(whichever is applicable) and I am available on (phone number)--------- to answer any queries relating to the above event. I will have copies of my insurance and qualifications at the event available for your perusal should you wish to view. If you do not wish for your child to have any nail art then please contact me for some alternative suggestions.
Kind Regards
----------------------------
This is just a rough very late night suggestion, as I dont have a copy ot hand.
Images and paper are easier enough to find on the internet and your home printer (as long as colour) is suffice to print them. I did them A4 and just added a few sparkles to the envelope.
Love ur ideas - i hope u r offering these yourself!! U'd make a fortune
Not doing them myself, I should do really(instead of setting others up in it lol)
Hope this helps someone x