First things first: do people really use it? Apparently they do. In the COCA, the frequency distribution looks like this:
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The pattern that jumps first to mind is a few + plural noun. But it's not exactly the same, and here we have to back up a few steps.
Quantificational nouns such as a lot, a bunch, and a majority are often followed by a prepositional phrase, headed by of, that the Cambridge Grammar of the English Language (CGEL) calls the oblique. For example, in the noun phrase a bunch of guys, the prepositional phrase of guys is the oblique. The oblique can be partitive or non-partitive. Where the reference is to a part of a larger group (e.g., a bunch of the guys) it is partitive but where the reference is to a whole group (e.g., a bunch of guys), it is non-partitive.
Here's how a few differs from a couple. You can have a few of the things (partitive) but not a few of things (non-partitive). Moreover, a few presents one more pattern: a few things (without of; a few is a dependent of things). This suggests that a few is not a quantificational noun at all, but rather a determinative (cf., many of the things, many things, & *many of things). To summarise:
Quantificational noun | Determinative | |
Partitive | a bunch of the guys | a few of the guys |
Non-partitive | a bunch of guys | *a few of guys |
Dependent (no of) | *a bunch guys | a few guys |
The question is, for those people, is the non-partitive construction also grammatical? It's so common that I imagine it must be, but I have no way of being sure.
Next, are there any other words that act like this? A dozen works very like few, as do numbers like hundred, thousand, million, etc. On the other hand, a myriad is exactly like a couple: for most people it's a quantificational noun, but for a few, it acts like a determinative. The following examples are from the OED.
1845 H. B. HIRST Poems 65 From every rocklet running, flow a myriad murmuring springs.Finally, I wonder what modifiers can work for each of these: a loud bunch of the guys, a very few of the words, a comparatively few people, a __ couple things, a __ myriad pieces of software.1886 W. W. STORY Fiammetta 189 The crickets were trilling a myriad infinitesimal bells in the grasses.1915 St. Nicholas June 709/2 There are a myriad worlds.1955 L. DE WOHL Spear (1957) III. vi. 220 There was a small thunderstorm..into which the people read a myriad signs and portents.1981 Harvard Jrnl. Asiatic Stud. 41 355 She would make me miserable a thousand, a myriad times.1992 N. STEPHENSON Snow Crash iii. 24 He is actually staring at the graphic representations..of a myriad different pieces of software.