the following works in xterm correctly: echo -e '\e[5m Blink Text\e[m\n' Other ANSI/VT100 Control sequences seems to work correctly
vte doesn't support blinking, and there are no current plans to add this (mis)feature. See https://bugzilla.gnome.org/show_bug.cgi?id=579964
Closing as this request is not for terminal but for vte.