Suggestions for Seasonalletters

The following packages have something in common with the package Seasonalletters. The packages are ordered in decreasing similarity.

Package background: Placement of background material on pages of a document
Package aeb-tilebg: AeB Tiling Backgrounds
Package gridpapers: Graph paper backgrounds and color schemes
Package gradback: Gradient backgrounds for dvips output
Package xwatermark: Graphics and text watermarks on selected pages
Package envelope-letter: Draw a layout to fold the first page of a letter into its own envelope
Package fadingimage: Add full width fading pictures at the top or bottom of a page
Package magicwatermark: An easy and flexible way to set watermarks
Package pagegrid: Print page grid in background
Package draftwatermark: Put a grey textual watermark on document pages
Package fancytabs: Fancy page border tabs
Package gradientframe: Simple gradient frames around objects
Package sectionbox: Create fancy boxed ((sub)sub)sections
Package notes: Mark sections of a document
Package block: A block letter style for the letter class
Package fullblck: Left-blocking for letter class
Package fax: Document class for preparing faxes
Package postcards: Facilitates mass-mailing of postcards (junkmail)
Package yaletter: Extremely flexible macros for letters, envelopes, and label sheets
Package cdpbundl: Business letters in the Italian style
Package envbig: Printing addresses on envelopes
Package myletter: An old letter class
Package serial: Generate serial letters
Package scrlttr2copy: A letter class option file for the automatic creation of copies
Package psboxit: Enables one to put a PostScript drawing behind a TeX box
Package shadbox: Shade the background of any box
Package gitstatus: Include Git information in the document as watermark or via variables
Package highlightx: Highlight formulas or paragraphs
Package proofread: Commands for inserting annotations
Package parselines: Apply a macro to each line of an environment
Package roundbox: Round boxes in LaTeX