Say you're working on a Ruby Gem structured like:

|-- bin
|   `-- sample_gem
`-- lib
    |-- sample_gem
    |   |-- bar.rb
    |   |-- baz.rb
    |   |-- biz.rb
    |   |-- foo.rb
    |   `-- version.rb
    `-- sample_gem.rb

Use this to open the full set of source files in Vim tabs:

vim -p bin/sample_gem lib/**/*.rb